A reference check is the cheapest diligence you will ever run and the one most people run worst. Twenty minutes on the phone, no cost, no travel, and access to someone who has already lived the experience you are about to buy. And yet the standard version goes like this: you call the two names the candidate supplied, they say lovely things, you say thank you, and you sign.
That call has a name. It is called a formality, and it exists to make you feel better about a decision you made in the interview.
This playbook is for the other kind. It works for three situations, and the mechanics barely change between them: you are hiring someone, you are about to sign a meaningful contract with a vendor or contractor, or you are about to take a job and want to know what the manager is actually like. Same call. Same questions. Different direction.
The rule that governs everything
Nobody will tell you something bad about a person in answer to a question that invites something bad.
“Were there any weaknesses?” gets you “he could be a bit of a perfectionist.” “Would you hire her again?” gets you “absolutely.” These questions ask a stranger to say a damaging thing about someone they know, on a recorded-feeling call, to a person they have never met, with unclear legal exposure. Of course the answer is bland. You designed it to be bland.
Every technique below is a way around that one problem. You do not ask for judgement. You ask for description, comparison, and specifics — and you let the judgement fall out of the answer.
Step 1: Build the list they didn’t give you
Listed referees are pre-warmed advocates. They are still worth calling — they establish the baseline story and they name other people — but a check built only on supplied names is a check built on the other side’s exhibit list.
You want three categories:
- One person above. A direct manager. The only person who can speak to whether the work met a standard.
- One person beside. A peer, a counterpart at another firm, someone on the other side of a handoff. Peers see the behaviour managers are shielded from.
- One person below or downstream. A direct report, a junior, a client, an end user. This is where character shows up. Anyone can manage upward for a year.
To find them, use the chain. At the end of every call, ask: “Who else worked closely with them that I should talk to?” Then call that person and open with “Priya suggested I speak to you.” A referral-sourced referee is not on script and did not know this call was coming. That is the entire value.
For vendors, ask a different question: “Can you give me a customer who left?” A vendor who can produce a churned customer and let you call them is telling you something real about their confidence. A vendor who cannot is telling you something too.
The consent line
Do not go around the candidate’s back. Say it plainly at offer stage: “We do references beyond the supplied list — usually a manager, a peer and someone who reported to you. Is there anyone you’d rather I didn’t contact, and why?” The answer to the second half is frequently the most informative thing you will hear all week, and asking it keeps you straight.
Step 2: Open the call so it isn’t a formality
The first sixty seconds decide what kind of call this is. Use this, close to verbatim:
“Thanks for making time. I’ll be quick — this is fifteen minutes, not an hour. I want to be upfront about what I’m doing: I’m not looking for a thumbs up or down. I’ve already decided I like them. What I’m trying to work out is how to manage them well and where they’ll struggle, so I don’t set them up to fail. Anything you tell me is to help them land, not to catch them out.”
This works because it is true and because it removes the referee’s risk. You have told them the job is safe. You are now asking for help, not testimony. People will say things to help someone succeed that they would never say to assess them.
Step 3: The seven questions
1. The scope question
“Walk me through what they actually owned. Not the title — what landed on their desk.”
Start here always. It is easy, it is factual, and it is where CV inflation dies. “Led the migration” becomes “was on the migration team, ran the testing workstream.” Both are fine. Only one is what you were told.
2. The percentile question
“Of everyone you’ve managed at that level, where do they fall? Top 10%, top quarter, solid middle?”
This is the single highest-yield question in the set, because comparison is socially safe in a way that criticism is not. “Solid middle” is not an insult, so people will say it — and “solid middle” from a manager who has run forty people is a very different hire from “top 10%.” If they say top 10%, follow with “who was better?”
3. The conditions question
“What environment do they need to be great in? And what environment would kill them?”
Framed as a fit question, so it costs the referee nothing to answer honestly. The second half is a weakness question wearing a helpful hat, and it gets answered nearly every time. “He needs a clear brief” means he cannot handle ambiguity. “She does best with a strong number two” means she does not do detail.
4. The last-time question
“Tell me about the last time something went badly wrong on their watch. What did they do in the first 48 hours?”
Everyone has one. If the referee cannot produce a single example, either they did not work closely with this person or the person never owned anything consequential. Both are findings. What you are listening for is whether the story includes the words “told me straight away.”
5. The reversal question
“If you were hiring them into this exact role — here’s the role — what would worry you?”
Describe the actual job in two sentences first. This converts an abstract endorsement into a specific judgement, and it gives the referee permission to raise a concern that is about the fit rather than about the person.
6. The instruction question
“If I hire them, what’s the one thing you’d tell me to do in the first month?”
Advice is free to give and highly revealing. “Give them a big project immediately” and “check in weekly for a while” are opposite answers about the same person.
7. The silence question
“Is there anything I haven’t asked that I should have?”
Then stop talking. Count to ten in your head. This question is where the real thing arrives about a third of the time, and it only arrives if you leave the space open long enough to be slightly uncomfortable.
Our take: if you only ever use two of these, use the percentile question and the silence question. Comparison gets you an honest ranking because ranking is not an accusation, and silence gets you the thing they came onto the call already wanting to say. The other five are there to earn you the right to ask those two.
Step 4: Read what you are actually hearing
References are rarely negative. They are evasive, and evasion has a grammar you can learn.
- Latency. A pause before “yes, absolutely” is worth more than the yes. Note where the pauses land, not just what follows them.
- Downshift to character. When you ask about output and get “lovely person, everyone adored her,” you have your answer about output. Warmth is what people substitute when competence is not available.
- The dates-only reference. “I can confirm employment from March 2023 to July 2025.” Sometimes that is genuine company policy. Sometimes it is a policy being enthusiastically remembered. Ask directly: “Is that a policy, or a choice?”
- Excessive specificity about one thing. A referee who returns three times to how good someone is at client presentations is steering you away from something else. Ask about the something else.
- “For what it was.” Any qualifier attached to praise — “great, for that stage of company,” “strong, given the team he had” — is the referee telling you the ceiling.
Write down verbatim quotes during the call, not summaries. Your summary is contaminated by what you already believe; the quote is not, and in a week the quote is the only part that still means anything.
Step 5: Triangulate, then decide
One reference is an anecdote. Three references are a pattern — and the pattern you want is the same weakness described three different ways. When a manager says “needs a clear brief,” a peer says “he’d go quiet when the goal moved,” and a report says “we sometimes didn’t know what we were doing that week,” you have found a real thing. Note it, and then decide whether your role has that shape.
A weakness that is real and irrelevant to the job is not a reason to walk. A weakness that is real and sits at the centre of the job is the whole answer. Most people conflate the two and either ignore every flag or panic at the first one.
The six failure modes
- Calling after you’ve decided. If the offer is out and the desk is ordered, you are not checking, you are ratifying. Call while you can still change your mind, and tell yourself out loud what would change it.
- Only calling the supplied list. Curated advocates confirm a curated story. Get one name off the chain or the check is decorative.
- Letting the referee interview you. They will ask about the role, the salary, the team. Answer in one sentence and return the ball. The person talking is not the person informing.
- Asking yes/no questions. Every one of them has a socially correct answer and everyone knows what it is. Ask for description and comparison instead.
- Delegating it to someone who wasn’t in the room. A recruiter running your reference call cannot hear the thing that contradicts the interview, because they were not at the interview. Whoever will manage this person makes the call.
- Taking a single strong negative at face value. Bad breakups exist, and so do managers who were the problem. One outlier against two solid references is a data point about the referee at least as often as about the candidate. Ask a fourth person.
Run it on the other side too
Everything here reverses. Before you take a job, ask to speak to someone who reported to your prospective manager and left. Ask them the conditions question about the manager. Ask them what they’d tell someone joining that team in their first month. A company that will not connect you to a former employee has answered you already, and the answer is not the one you wanted.
Twenty minutes, a legal pad, seven questions and the discipline to shut up after the last one. It is the highest return on time available in any hiring or buying decision you will make this year, and almost nobody does it properly.